Board drop hammer



juiy 23, 1935.. I M. s. REED 2,009,i5@

BOARD DROP HAMMER Filed June 8, 1932 5 Sheets-Sheet l- Juiy 23, 1935 M. s. REED 2,309,150

BOARD DROP HAMMER Filed June 8, 1952 3 Sheets-Sheet 2 HM: um

MWZWMJ 'INVENTOR.

A TTORNEYS.

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Juiy 23,1935. I M. s. REED BOARD DROP HAMMER- 3 Sheets-Sheet 3 Filed June 8, 1932 hwczamu JQWL INVENTOR.

BY 7/7: W

ATTORNEYS.

Patented July 23, 1935 Foundry Company, Pennsylvania Application June 8, 1932, Serial 18 Claims.

In some types of hammers, particularly board drop hammers, it is desirable toqvary the stroke of the hammer so as to vary the blow and to accomplish this during the continued action of the hammer so that during a part of a forging operation heavy blows may be delivered and during another part of the forging operation lighter and more rapid blows may be delivered. The present invention is designed to accomplish this in a convenient and effective manner. Features and details (of the invention will appear from the specification and claims.

Preferred embodiments of the invention are illustrated inthe accompanying drawings as follows: Fig. 1 shows a front elevation of the hammer.

Fig. 2 a view of the starting and stopping mechanism detached.

Fig; 'Z'aside elevation'of the stroke varying deviceswith the hammer in a lifted position. -Fig.- 4-anen1arged viewof the control rod latch.

Fig. f5ja section on the line'5- 5 in Fig. 4,

"Fig; 5a an enlarged view of a yielding positioning link, of a stroke varying device. M 9 Fig. 6 an enlarged plan viewof the pedal mechanism.

Rig. '7 asecltion on the line '!1 in Fig. .6. Fig. 8 asection on the line 87-8 inFig. 6 with the pedal in position for stopping vthehammer.

Fig. 9 a similar view with the .pedal depressed inposition to start the hammer.

Fig. 10 a .similarview withthe pedal posi- .tioned toproduce one length of stroke.

I Fig. 11 a similar view with the pedal differently tilted to produce a different length'of stroke.

,Fig. 12 a'detached front elevation of amodifled stroke varying mechanism with the hammer headin the lowest position. 5 1 g i Fig.13 a similar View with the hammer head in a raised position. j Fig.-1 4 a section on the line l4-- l4 in Fig. 13. =-l marks the frame of the hammer, 2 the head of the hammer, 3 the operating rollsf l ,the shafts on which the operating rolls are mounted, 5 the eccentrics in which the shafts are journaled, .6 the bearings for the eccentrics mounted on the head. 1 levers controlling the eccentrics, .8 the control rod, 8a the adjusting rod, 9 a motor Erie; Pa, a corporation of secured in the head andoperatesxon a .bOttOllL'diG I Ill which is mounted iniabas'e l5.

Clamps l6are pivotally mounted inalbracket l 'l secured on the head] The clampsisareioperated by a lever l8 which operates on at least oneuoi the pivot pins 1920f the clamp arms. extends from the lever l 8 to a lever 2 I; The lever 21 is pivoted at 2'2 inthe frame anda link-21inchmeets the lever 2| with a rockarm 24. The 'rock arm is mounted on a'shaft 125 being clamped thereon by a clamping bo1t':.-26.i '2[he shaft 25 is preferably square, but has rounded portions'journaled in bearings 21 on the frame. Asecond'rock arm' 24a is arranged on the shaft/-25 and a rod 28 extends between the rock -anns 24! and 2411 and'is provided with a sleeve 29; A pedal 301s mountedon the sleeve. I k

. The operator by releasing the edal can throw the cams into lockingpositionso as to automatically engage the boards'at the top of the stroke, or by depressing the pedal may throw open' the clamps to permit the -boards to reciprocate "in'the ordinary operation-of the hammer.' Th'e parts far described with the functions so far attributed to these parts aresubstan-tially similar to ham.- mers commonly made and the .diiferent parts'opcrate in the usual manner of typeof hammer. The controlling rod-8 carries a -trip block 31 and with the rod in the upper position, thetrip block 3| rests on a stop 32. Ihe trip stop" 32=is secured on an outwardly =bent portion of a cam block 33 and-is adjustably secured thereto by ascrew 34, The bolt is crowded forward by. a spring 1356perating around a shank 35; The shank is mounted in and guided-by a-bearing lug 31 extending from the frame. 'Iliebolt has a stop 39' which engages a strap 38 so as to definitely position the front end of thebolt with relation to the pathof the-hammer. The front end of the boltshas' a cam surface 40 whichis adapted' to engage and be actuated by-a cam surface "41 on the head. This trip mechanism so far as-{describedis one 'of common construction. It willbe unders'tcod that as the headforces the bolt inwar the year, it moveskthestop 32 -from under the trip block 3| permitting the control rod '8 to drop and thus throws the rollers into closed=position so as to crowd the board and lift the head;

The mechanism a for automatically opening the rolls and in the present mechanism for varying the point at which the rolls arepp'ened' is as follows: A :lever 42* is journaled on a; pinfla extending from the frame. A link 43 connects the lever 42 with the tlfi blocki'l. n finger $4 is pivoted to the end of the lever fl anditsfree end is arranged in the path of one of the shoulders 45, 46, or 41 on the head, depending on the length of stroke desired. A bell crank 48 is pivoted on the pin 42a and a yielding link 49 connects the finger 44 with one arm of the bell crank. This yielding link has a sliding rod extending into a sleeve 50. A spring 5| is arranged in the sleeve around the rod and against a shoulder 52 on the rod. The shoulder forms the base for the spring and also for a stop which definitely fixes the outer position of the rod. The opposite arm of the bell crank is connected by a link 53 with the control pedal mechanism, being directly connected with an arm 54 of a bell crank 55. The bell crank lever is journaled on a round spot 56 on the shaft 25. An arm 5lofthe bell crank lever is connected by a link 58 with an arm 59 fixed on the sleeve 29 so as to swing with the pedal as it is tilted.

This control mechanism operates in the ordinary manner to lift therod 8 on the upward stroke of the head and thus automatically to open the rolls and permit the downward stroke of the head; The trip block'as it reaches its upper position releases the stop 32 which moves under the trip block and locks the rod 8 in its upper position until the head in its lowermost position forces the bolt 33 outwardly and again releases the block 3|. The peculiar feature of this invention in this respect isthe means by which the lifting :of the rod 8 may be timed in different parts of the upward stroke so as to release the hammer sooner, or later, so as to give a length of stroke that may be desired. .This affords the blow necessary for heavier-work, and for lighter work ,with the shorter stroke speeds up the hammer materially. When it is desired to have the stroke full'length, the pedal is tilted tothe position shown in Fig. 10 .which will swing the outer arm of the bell crank lever upwardly and the finger 44. outwardly into the path of the shoulder 45. Tilting to the opposite direction, as shown in Fig. 11, the finger is moved in the path of the shoulder (41 and a very shortrstroke' results. With the pedal in the horizontal position the finger is brought into the path of the shoulder 45 and a medium stroke of the hammer results.

It will be noted that as the pedal is forced downwardly this downward movement does not change the position of the control finger. So that by merely forcing the pedal down to start the hammer the medium blow automatically follows without any attention of the operator. On the other hand, the pedal may be retained in its lower position so that the hammer will continue in action and the pedal may be tilted in either direction, thus giving a long or short stroke, or may be adjusted to give the medium stroke, as the operator may desire. The finger 44 is definitely positionedin its downward position by the stop 52, but as, the head, ascends and the lever 42 swings the link yields to permit the end of the finger to follow the straight line path of the shoulder on which the finger rests.

The rod 8a shown in Fig. 2 is merely used as an adjustment for what, is normally the stationary roll so as to adjust the rolls for different thicknesses of boards, v

In the modified structure shown in Figs. 12 and 13, the rod 53 is connected to a bell crank lever 6;! which is pivoted on a pin 62 and this pin is carried by a sliding block 63 sliding in a guide slot 64 in the frame. A lever 65 is pivoted on the .pin 62 and a finger-'61 is pivoted on the end of the lever 65.. A rig id link 63 extends from the finger 61 to an arm 69 of the bell crank lever 6|, the link forming a paralleling mechanism with the lever 65. The path of the finger end of the lever 65 is controlled by a swinging link 10 which is pivoted to the lever 65 and on the frame. The head is provided with the operating shoulders II and 12.

As the finger engages the shoulder on the head and the lever 65 is forced upwardly the lever is moved endwisethrough the action 'of the link 10, this endwise movement being accommodated by the sliding block 63, the combined action of the link 68 and the endwise movement of the lever giving to the end of the finger a path approximating the path of the shoulder. So that the lever follows up the movement of the head and communicates its movement through the link 68 with the trip block 3|, the mechanism operating in the same manner as the mechanism of Fig. 1.

What I claim as new is:-- I

1, In a hammer, the combination of a frame;

a hammer head mounted in the frame; actuating means reciprocating the head; mechanism stopping and starting the hammer action; means controlling the actuating means for continued operation and with variable stroke; and a single manually operable device mounted for movement in one way controlling the mechanism and for movement in a distinctly different Way for independently operating the controlling means to vary the stroke. V 2. In a board drop hammer, the combination of a frame; a hammer head; a board on the head; rolls actuating the board; a stopping and starting mechanism; a roll controlling means automatically throwing the rolls into and out of lifting engagement with the board; a stroke-varying means acting on thecontrollingmeans to vary the stroke; and'a pivoted and bodily movable pedal-actuated means operable by an operators foot extending to opposite sides of the axis of the means with the hammer in action controlling the mechanism by a bodilymovement of the pedal and the stroke varying means by a pivotal movement of the pedal. 1

3. In a board drop hammer, the combination of a frame; a hammer head; a board on the head;

rolls actuating the board; a stopping and starting mechanism; a roll controlling means automatically throwing the rolls into and out of lifting engagement with the board; a stroke-varying means acting on the controlling means to vary the stroke; and a single device mounted for movement in one way controlling the mechanism and mounted for movement in a distinctly different way for independently operating the stroke varying means. Y

4. In a board drop, hammer, the combination of a frame; a hammer head; a board on the head; rolls actuating the board; a stopping and start: ing mechanism; a roll controlling means auto- 'matically throwing the rolls into and out of lifting engagement with'the board; stroke-varying means acting onthe controlling means to vary the stroke; devices comprising a pivoted pedal operable with a pivotal movement on the pedal axis with the'hammer in action controlling the stroke-varying means; and means operable by a movement bodily of the pedal controlling the mechanism.

5. In a board drop hammer, the combination of a frame; a hammer head; a board on the head; rolls actuating the board; a stopping and starting mechanism; a roll controlling means com- .prisinga control rod operating the rolls relatively-towardand from eachother; hammer responsive means comprising stepped shoulders moving with the head; 'a control device engaged by said shoulders and adjustable to different shoulders controlling the opening movement 'of the rod to varythe stroke of thehammer; and a single manually operable device mounted for movement in one way controlling the-mechanism andfor movement in a distinctly different way for independently operating the control device to vary the stroke.

6. In aboard drop hammer, the combination of a frame; a hammer head; a board on the head; rolls actuating the board; a-control rod controlling the opening and closing of the rolls; stepped shoulders moving with the head; a control lever actuating the rod to open the rolls; a stroke controlfinger on the lever in the path of the shoulders; andmeans varying the'position of the finger on the lever to lie in the path of and engage a selected shoulder to vary the stroke of the ham- =mer.

' 7. In a board drop hammer, the. combination of a frame; a hammer head; 'a board on the head; rolls actuating the board; a control rod controlling the opening and closing of the rolls; stepped shoulders moving with the head; a control lever actuating the rod to open the rolls; a swinging finger mounted on the lever and adapted to be swung into the path of the shoulders; and means varying the position of the finger to lie in the path of and engage a selected shoulder to vary the stroke of the hammer com,- prising a link secured to the finger and a pivot for the link off-set from the axis of the lever varying the path of the engaged end of the finger as the lever swings.

8. In a board drop hammer, the combination of a frame; a hammer head; a board on the head; rolls actuating the board; a control rod controlling the opening and closing of the rolls; stepped shoulders moving with the head; a control lever actuating the rod to open the rolls;

a swinging finger mounted on the lever and,

adapted to be swung into the path of the shoulders; and means varying the position of the finger to lie in the path of and engage a selected shoulder to vary the stroke of the hammer comprising a yielding link secured to the finger and a pivot for the link off-set from the axis of the lever varying the path of the engaged end of the finger as the lever swings.

9. In a board drop hammer, the combination of a frame; ahammer head; a board on the head; rolls actuating the board; a control rod controlling the opening and closing of the rolls; stepped shoulders moving with the head; a control lever actuating the rod to open the rolls; a swinging finger mounted von the lever and adapted to be swung into the path of the shoulders; means varying the position of the finger to lie in the path of and engage a selected shoulder to vary the stroke of the hammer comprising a link secured to the finger and a pivot off-set from the axis of the lever varying the path of the engaged end of the finger as the lever swings; and means moving the fulcrum crosswise of its axis of the lever to define the path of the engaging end of the finger to the path of the engaged shoulder.

10. In a board drop hammer, the combination of a frame; a hammer head; a board on the head; rolls actuating the board; a stopping and starting mechanism; a roll controlling means comprising a control .rod operating =.the rolls toward and from each other; hammer responsive means engaging a part moving with the head actuating the rod to open the rolls at a point in the lifting stroke, devices varying the point of operative engagement of the hammer responsive means; and a single-manually operable device mounted for movement-in one Way-controlling the mechanism and for movement in a distinctly different way for independently operating the devices.

11. In a board drop hammer, the combination of a frame; a. hammer head; a board on .the head; rolls actuating the board; a stopping and starting-mechanism; a roll-controlling. means comprising :a control rod operating the rolls toward and from each other; hammer responsive means comprising stepped shoulders moving with the head; a control device engaged by'said shoulders and adjustable to different shoulders controlling the opening movement-of the rod to vary the stroke of the hammer; anda singlemanually operable device mounted for movement in one way for controlling .the mechanism and for movement in a distinctly difierent way for independently operatingthe devices. I

12. In a board drop hammer, the combination of a frame; a hammer head; a board ,on the head; rolls actuating the board; mechanism stopping and starting the hammer action; a control rod controlling the opening and closing of the rolls; stepped shoulders moving with the head; a control lever actuating the rod to open the rolls; a stroke control finger on the lever in the path of the shoulders; means varying the position of the finger on the lever to lie in the path-of and engage a selected shoulder to vary the stroke of the hammer; and a single manually operable device for actuating the mechanism and the means.

13. In a hammer, the combination of a frame; a hammer head mounted in the frame; actuating means reciprocating the head; mechanism stopping and starting the hammer action; means controlling the actuating means for continued operation; devices varying the stroke; a rock arm controlling the mechanism; a pedal tiltingly mounted on the rock arm for operating the rock arm through the direct thrust of the pedal on the arm; and a connection between the pedal and the devices actuating the devices through a tilting action of the pedal on the rock arm.

14. In a hammer, the combination of a frame; a hammer head mounted in the frame; actuating means reciprocating the head; mechanism stopping and starting the hammer action; means controlling the actuating means for continued operation; devices varying the stroke; a rock arm controlling the mechanism; a pedal tiltingly mounted on the rock arm for operating the rock arm through the direct thrust of the pedal on the arm; and a connection between the pedal and the devices actuating the devices through a tilting action of the pedal on the rock arm, comprising a rocker actuated by the pedal, a bell crank lever, a link between the rocker and the bell crank lever, and a connection between the means to vary the stroke comprising a, rock arm controlling the mechanism; a pedal tiltingly mounted on the rock arm through the direct thrust of the pedal on the arm for operating the rock arm to control the mechanism; and a connection between the pedal and the stroke varying means actuating the stroke varying means through the tilting action of the pedal on the rock arm to control said stroke-varying means.

16. In a board drop hammer, the combination of a frame; a hammer head; a board on the head; rolls actuating the board; a stopping and starting mechanism; a roll controlling means automatically throwing the rolls into and out of lifting engagement with the board; stroke-varying means acting on the controlling means to vary the stroke; a rock arm actuating the mechanism; a pedal tiltingly mounted onand actuating the rock arm through direct thrust of the pedal on the arm; and a connection between the pedal and the stroke varying means actuating the stroke-varying means through the tilting of the pedal on the arm comprising a bell crank, a connection between the bell crank and the pedal, and a connection between the bell crank and the means whereby a movement of the rock arm controls the starting mechanism and a movement of the pedal on the rock arm controls the strokevarying means.

-17. The combination of a'frame; a reciprocating mechanism carried by the frame; mechanism controlling the reciprocation; devices varying the nature of the reciprocation; a rock arm; a connection between the rock arm and the mechanisr'n, controlling the action of the mechanism; a pedal pivotally mounted between its ends on the rock arm and operating-the rock arm through direct thrust on the pedal; and connections between the pedal and the devices, communicating the pivotal movement of the pedal to the devices, said pedal operating selectively and independently the mechanism through the rock arm by direct thrust on the pedal and the devices through the tilting of the pedal, said tilting movement being adapted to be effected by the rocking movement of an operators foot at the ankle.

18. The combination of two control mechanisms; a control pedal; 'a mounting for the control pedal movable with and actuated by a direct bodily movement of the pedal; a pivotal connection between the pedal and the mounting having an axis intermediate the ends of the pedal; and means selectively and independently conveying the movement of the mounting under the direct thrust of the pedal to one control mechanism and the tilting movement'of the pedal to the other control mechanism.

r MACDONALD S. REED. 

